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Cheap flights Ontario — London

Ontario (ONT, US) London (LON, GB)
from $356 8 725 km ~10h 46m 5 flights found 2 airlines cheapest on Wednesday
Reverse route
How many travellers?
Adults
12+ years
1
Children
2–11 years
0
Infants
under 2
0
Choose your departure date
Cheapest: $356 on 09.12.2026
Prices shown are from searches by other travellers over the last 24 hours. Missing a date? Click any day — we'll find tickets anyway.
November 2026
Mo
Tu
We
Th
Fr
Sa
Su
December 2026
Mo
Tu
We
Th
Fr
Sa
Su
January 2027
Mo
Tu
We
Th
Fr
Sa
Su
Prices found for 4 of 90 days. Prices update as more travellers search. Click any date to search live.
Depart
—
Return
—
Cheapest flights found
09 Dec 2026, Wed
Frontier Airlines F9 1500
17:00
ONT Ontario International Airport
06:44
STN Stansted Airport
13h 44m 3 stops
Mytrip.com
$356
View this ticket
18 Nov 2026, Wed
Frontier Airlines F9 2232
21:35
ONT Ontario International Airport
11:55
LHR London Heathrow Airport
14h 20m 3 stops
Kiwi.com
$367
View this ticket
26 Nov 2026, Thu
Frontier Airlines F9 1500
17:45
ONT Ontario International Airport
06:46
LHR London Heathrow Airport
13h 1m 2 stops
Mytrip.com
$433
View this ticket
27 Jan 2027, Wed
Alaska Airlines AS 1529
18:20
ONT Ontario International Airport
12:00
LHR London Heathrow Airport
17h 40m 3 stops
Aviakassa
$518
View this ticket
Route characteristics
Distance
8 725 km
Flight time
10h 46m
Time difference
+8h
Minimum price
from $356 (09.12.2026)
Average price
$419
Maximum price
$518
Cheapest day
Wednesday
Departure airports (1)
ONT Ontario International Airport
Arrival airports (2)
LHR London Heathrow Airport STN Stansted Airport
Airlines (2)
F9 Frontier Airlines AS Alaska Airlines
Agencies (3)
Mytrip.com Kiwi.com Aviakassa
Prices by day of week
Wednesday
$356
avg $414
Cheapest
Thursday
$433
avg $433
Price trend by month
November 2026
from $367
avg $400
2 flights
December 2026
from $356
avg $356
1 flights
January 2027
from $518
avg $518
1 flights
Airlines — cheapest prices 2
Frontier Airlines
Frontier Airlines
Low-cost 4 flights · 4 days
$356
Alaska Airlines
Alaska Airlines
1 flights · 1 days
$518
Where to buy tickets 3
Mytrip.com
2 tickets · 2 days
from $356
Kiwi.com
2 tickets · 2 days
from $367
Aviakassa
1 tickets · 1 days
from $518
Airports

From — Ontario (1)

  • ONT Ontario International Airport

To — London (2)

  • LHR London Heathrow Airport
  • STN Stansted Airport
Other destinations from Ontario
Albuquerque
US
Accra
GH
Nantucket
US
Adelaide
AU
San Andres Island
CO
Malaga
ES · Hub
Auckland
NZ
Almaty
KZ
Alicante
ES
Ahmedabad
IN
Amsterdam
NL · Hub
Anchorage
US
Frequently asked questions about the route Ontario — London
How long is the flight from Ontario to London?
Approximate flight time — 10h 46m. This is an average for a direct flight. With connections, the time may be longer.
What is the distance from Ontario to London?
The straight-line distance — 8 725 km.
How much do flights from Ontario to London cost?
The minimum price over 3 months — from $356 on 09.12.2026.
What is the average ticket price?
The average price — $419. Range: $356 — $518.
What is the time difference between Ontario and London?
The difference — +8h.
From which airports does Ontario operate flights?
From Ontario: ONT (Ontario International Airport).
To which airports in London do flights arrive?
To London: LHR (London Heathrow Airport), STN (Stansted Airport).
Which airlines fly this route?
This route is served by 2 airlines: Frontier Airlines, Alaska Airlines.
Which day of the week is cheapest?
The cheapest day of the week — Wednesday.
When is the best time to buy tickets?
Optimal — 1–3 months before departure. Check the calendar above — it shows the best dates.
How do I book flights?
Click "View this ticket" on any flight card — you'll be redirected to the booking page with this specific ticket pre-selected.
About the route Ontario — London

Flights Ontario — London is a popular route. The straight-line distance is 8 725 km. Flight time 10h 46m. Time difference +8h.

From Ontario (ONT) flights depart from 1 airport: ONT. To London (LON) — 2 arrival airports: LHR, STN.

2 airlines operate on this route: Frontier Airlines, Alaska Airlines.

The minimum price for the next 3 months — from $356 (09.12.2026). The cheapest dates are highlighted in the calendar above.

The average ticket price — $419, ranging from $356 to $518. Book 1–3 months in advance to get the best deals.

Cheapest day to fly — Wednesday.

Other destinations in United Kingdom from Ontario
Manchester
GB

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